Edge-channel interferometer at the graphene quantum Hall pn junction

Journal Article · Mon May 04 04:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4919380· OSTI ID:22399012

Morikawa, Sei; Moriya, Rai ^[1]; Masubuchi, Satoru; Machida, Tomoki ^[1]; Watanabe, Kenji; Taniguchi, Takashi ^[2]

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1. Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan)
2. National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan)

We demonstrate a quantum Hall edge-channel interferometer in a high-quality graphene pn junction under a high magnetic field. The co-propagating p and n quantum Hall edge channels traveling along the pn interface functions as a built-in Aharonov-Bohm-type interferometer, the interferences in which are sensitive to both the external magnetic field and the carrier concentration. The trajectories of peak and dip in the observed resistance oscillation are well reproduced by our numerical calculation that assumes magnetic flux quantization in the area enclosed by the co-propagating edge channels. Coherent nature of the co-propagating edge channels is confirmed by the checkerboard-like pattern in the dc-bias and magnetic-field dependences of the resistance oscillations.

• OSTI ID: 22399012
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 106; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AHARONOV-BOHM EFFECT
CONCENTRATION RATIO
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
GRAPHENE
INTERFACES
INTERFERENCE
INTERFEROMETERS
MAGNETIC FIELDS
MAGNETIC FLUX
OSCILLATIONS
P-N JUNCTIONS
QUANTIZATION